let CalendarData = new Array(100);
const madd = new Array(12);
const tgString = '甲乙丙丁戊己庚辛壬癸';
const dzString = '子丑寅卯辰巳午未申酉戌亥';
const numString = '一二三四五六七八九十';
const monString = '正二三四五六七八九十冬腊';
const weekString = '日一二三四五六';
const sx = '鼠牛虎兔龙蛇马羊猴鸡狗猪';
let cYear; let cMonth; let cDay; let
  TheDate;
CalendarData = [0xA4B, 0x5164B, 0x6A5, 0x6D4, 0x415B5, 0x2B6, 0x957, 0x2092F, 0x497, 0x60C96, 0xD4A, 0xEA5, 0x50DA9, 0x5AD, 0x2B6, 0x3126E, 0x92E, 0x7192D, 0xC95, 0xD4A, 0x61B4A, 0xB55, 0x56A, 0x4155B, 0x25D, 0x92D, 0x2192B, 0xA95, 0x71695, 0x6CA, 0xB55, 0x50AB5, 0x4DA, 0xA5B, 0x30A57, 0x52B, 0x8152A, 0xE95, 0x6AA, 0x615AA, 0xAB5, 0x4B6, 0x414AE, 0xA57, 0x526, 0x31D26, 0xD95, 0x70B55, 0x56A, 0x96D, 0x5095D, 0x4AD, 0xA4D, 0x41A4D, 0xD25, 0x81AA5, 0xB54, 0xB6A, 0x612DA, 0x95B, 0x49B, 0x41497, 0xA4B, 0xA164B, 0x6A5, 0x6D4, 0x615B4, 0xAB6, 0x957, 0x5092F, 0x497, 0x64B, 0x30D4A, 0xEA5, 0x80D65, 0x5AC, 0xAB6, 0x5126D, 0x92E, 0xC96, 0x41A95, 0xD4A, 0xDA5, 0x20B55, 0x56A, 0x7155B, 0x25D, 0x92D, 0x5192B, 0xA95, 0xB4A, 0x416AA, 0xAD5, 0x90AB5, 0x4BA, 0xA5B, 0x60A57, 0x52B, 0xA93, 0x40E95];
madd[0] = 0;
madd[1] = 31;
madd[2] = 59;
madd[3] = 90;
madd[4] = 120;
madd[5] = 151;
madd[6] = 181;
madd[7] = 212;
madd[8] = 243;
madd[9] = 273;
madd[10] = 304;
madd[11] = 334;

export default class GetLunarDayData {
  constructor() {
  }

  static GetBit(m, n) {
    return (m >> n) & 1;
  }

  static e2c() {
    TheDate = (arguments.length != 3) ? new Date() : new Date(arguments[0], arguments[1], arguments[2]);
    let total; let m; let n; let k;
    let isEnd = false;
    let tmp = TheDate.getYear();
    if (tmp < 1900) {
      tmp += 1900;
    }
    total = (tmp - 1921) * 365 + Math.floor((tmp - 1921) / 4) + madd[TheDate.getMonth()] + TheDate.getDate() - 38;

    if (TheDate.getYear() % 4 == 0 && TheDate.getMonth() > 1) {
      total++;
    }
    for (m = 0; ; m++) {
      k = (CalendarData[m] < 0xfff) ? 11 : 12;
      for (n = k; n >= 0; n--) {
        if (total <= 29 + GetLunarDayData.GetBit(CalendarData[m], n)) {
          isEnd = true; break;
        }
        total = total - 29 - GetLunarDayData.GetBit(CalendarData[m], n);
      }
      if (isEnd) break;
    }
    cYear = 1921 + m;
    cMonth = k - n + 1;
    cDay = total;
    if (k == 12) {
      if (cMonth == Math.floor(CalendarData[m] / 0x10000) + 1) {
        cMonth = 1 - cMonth;
      }
      if (cMonth > Math.floor(CalendarData[m] / 0x10000) + 1) {
        cMonth--;
      }
    }
  }

  static GetcDateString() {
    let tmp = '';
    tmp += tgString.charAt((cYear - 4) % 10);
    tmp += dzString.charAt((cYear - 4) % 12);
    tmp += '(';
    tmp += sx.charAt((cYear - 4) % 12);
    tmp += ')年 ';
    if (cMonth < 1) {
      tmp += '(闰)';
      tmp += monString.charAt(-cMonth - 1);
    } else {
      tmp += monString.charAt(cMonth - 1);
    }
    tmp += '月';
    tmp += (cDay < 11) ? '初' : ((cDay < 20) ? '十' : ((cDay < 30) ? '廿' : '三十'));
    if (cDay % 10 != 0 || cDay == 10) {
      tmp += numString.charAt((cDay - 1) % 10);
    }
    return tmp;
  }

  // 获取农历节日
  GetLunarDay(solarYear, solarMonth, solarDay) {
    // solarYear = solarYear<1900?(1900+solarYear):solarYear;
    if (solarYear < 1921 || solarYear > 2020) {
      return '';
    }
    solarMonth = (parseInt(solarMonth) > 0) ? (solarMonth - 1) : 11;
    GetLunarDayData.e2c(solarYear, solarMonth, solarDay);
    return GetLunarDayData.GetcDateString();
  }

  // 获取某一天的节气
  getJieQi(yyyy, mm, dd) {
    mm -= 1;
    const sTermInfo = [0, 21208, 42467, 63836, 85337, 107014, 128867, 150921, 173149, 195551, 218072, 240693, 263343, 285989, 308563, 331033, 353350, 375494, 397447, 419210, 440795, 462224, 483532, 504758];
    const solarTerm = ['小寒', '大寒', '立春', '雨水', '惊蛰', '春分', '清明', '谷雨', '立夏', '小满', '芒种', '夏至', '小暑', '大暑', '立秋', '处暑', '白露', '秋分', '寒露', '霜降', '立冬', '小雪', '大雪', '冬至'];
    let tmp1 = new Date((31556925974.7 * (yyyy - 1900) + sTermInfo[mm * 2 + 1] * 60000) + Date.UTC(1900, 0, 6, 2, 5));
    let tmp2 = tmp1.getUTCDate();
    let solarTerms = '';
    if (tmp2 == dd) { solarTerms = solarTerm[mm * 2 + 1]; }
    tmp1 = new Date((31556925974.7 * (yyyy - 1900) + sTermInfo[mm * 2] * 60000) + Date.UTC(1900, 0, 6, 2, 5));
    tmp2 = tmp1.getUTCDate();
    if (tmp2 == dd) { solarTerms = solarTerm[mm * 2]; }
    return solarTerms;
  }
}
